CN110266411A - Low-complexity sequence detection method for dual-antenna telemetry system - Google Patents
Low-complexity sequence detection method for dual-antenna telemetry system Download PDFInfo
- Publication number
- CN110266411A CN110266411A CN201910540015.XA CN201910540015A CN110266411A CN 110266411 A CN110266411 A CN 110266411A CN 201910540015 A CN201910540015 A CN 201910540015A CN 110266411 A CN110266411 A CN 110266411A
- Authority
- CN
- China
- Prior art keywords
- xtcom
- alamouti
- symbols
- soqpsk
- follows
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 45
- 238000004364 calculation method Methods 0.000 claims description 11
- 230000014509 gene expression Effects 0.000 claims description 5
- 230000010363 phase shift Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims 3
- 238000013508 migration Methods 0.000 claims 2
- 230000005012 migration Effects 0.000 claims 2
- 230000007704 transition Effects 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 7
- 230000001186 cumulative effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000004083 survival effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005316 response function Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0072—Error control for data other than payload data, e.g. control data
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
技术领域technical field
本发明涉及无线通信及遥测遥控技术领域,提供一种低复杂度的Alamouti-SOQPSK-TG遥测系统序列检测方法。The invention relates to the technical field of wireless communication and telemetry and remote control, and provides a low-complexity Alamouti-SOQPSK-TG telemetry system sequence detection method.
背景技术Background technique
SOQPSK(Shaped Offset Quadrature Phase Shift Keying,成形偏移正交相移键控)这种调制方式具有相位连续、包络恒定、功率效率高及频谱效率高等优点,在遥测遥控、深空通信等领域具有广泛应用。SOQPSK-TG(Shaped Offset Quadrature Phase ShiftKeying-Telemetry Group Version,遥测版成形偏移正交相移键控)是专为遥测系统设计的SOQPSK信号。Alamouti-SOQPSK-TG遥测系统见参考文献1,其发送端编码调制部分的结构如图1所示,设要发送的二进制序列为b,在序列b中每4个bit分为一个码块(如虚线框中所示,b4k,b4k+1,b4k+2,b4k+3为一个码块),经过Alamouti编码器得到两路并行的序列b0、b1。序列b0、b1中分别与序列b中的码块对应的4个bit(如实线框中所示)称为Alamouti码块,如图1所示,为一个Alamouti码块,为一个Alamouti码块,和对应b4k,b4k+1,b4k+2,b4k+3,分别将b0和b1通过SOQPSK-TG调制器,得到两路信号s0和s1并用两根天线分别发送出去。接收端结构如图2所示,利用一根天线接收信号,对接收信号进行基带处理、参数估计、定时和载波同步、序列检测,得到发送序列b。SOQPSK (Shaped Offset Quadrature Phase Shift Keying, Shaped Offset Quadrature Phase Shift Keying) has the advantages of continuous phase, constant envelope, high power efficiency and high spectrum efficiency. widely used. SOQPSK-TG (Shaped Offset Quadrature Phase ShiftKeying-Telemetry Group Version, telemetry version shaped offset quadrature phase shift keying) is a SOQPSK signal specially designed for telemetry systems. See reference 1 for the Alamouti-SOQPSK-TG telemetry system. The structure of the coding and modulation part of the sending end is shown in Figure 1. Suppose the binary sequence to be sent is b, and every 4 bits in the sequence b are divided into a code block (such as As shown in the dashed box, b 4k , b 4k+1 , b 4k+2 , and b 4k+3 are a code block), and two parallel sequences b 0 and b 1 are obtained through the Alamouti encoder. The four bits in sequences b 0 and b 1 corresponding to the code blocks in sequence b (as shown in the solid line box) are called Alamouti code blocks, as shown in Figure 1, is an Alamouti code block, is an Alamouti code block, and Corresponding to b 4k , b 4k+1 , b 4k+2 , b 4k+3 , respectively pass b 0 and b 1 through the SOQPSK-TG modulator to obtain two signals s 0 and s 1 and send them out with two antennas respectively. The structure of the receiving end is shown in Figure 2. An antenna is used to receive signals, and baseband processing, parameter estimation, timing and carrier synchronization, and sequence detection are performed on the received signals to obtain the transmission sequence b.
Alamouti-SOQPSK-TG遥测系统接收端序列检测部分通常将Alamouti码块中4个bit每种可能的组合对应为一种可能的状态,状态转移过程中所有可能的分支路径对应的信号波形提前存好,进行序列检测时先计算其与接收信号的欧式距离作为分支路径度量增量,最后利用Viterbi算法完成序列检测。参考文献1中指出状态转移过程中所有可能的分支路径对应得信号波形可以用XTCOM(Cross-correlated Trellis-coded QuadratureModulation,互相关网格编码正交调制)符号来表示,并提出8波形XTCOM法和2048波形XTCOM法,8波形XTCOM法能大幅减少检测的复杂度,但检测性能较差;2048波形XTCOM法性能较好,但复杂度极高,基本无法实现。The sequence detection part of the receiving end of the Alamouti-SOQPSK-TG telemetry system usually corresponds to each possible combination of the 4 bits in the Alamouti code block as a possible state, and the signal waveforms corresponding to all possible branch paths during the state transition process are stored in advance , when performing sequence detection, first calculate the Euclidean distance between it and the received signal as the branch path metric increment, and finally use the Viterbi algorithm to complete the sequence detection. Reference 1 pointed out that the signal waveforms corresponding to all possible branch paths in the state transition process can be represented by XTCOM (Cross-correlated Trellis-coded Quadrature Modulation, cross-correlated trellis-coded quadrature modulation) symbols, and proposed the 8-waveform XTCOM method and The 2048 waveform XTCOM method and the 8 waveform XTCOM method can greatly reduce the complexity of detection, but the detection performance is poor; the 2048 waveform XTCOM method has better performance, but the complexity is extremely high, and it is basically impossible to realize.
发明内容Contents of the invention
本发明要解决的技术问题是,提供一种低复杂度的Alamouti-SOQPSK-TG遥测系统序列检测方法。相比8波形XTCOM法,本方法能够在更低的信噪比条件下可靠检测;相比2048波形XTCOM法,本方法计算复杂度大大降低。The technical problem to be solved by the present invention is to provide a low-complexity Alamouti-SOQPSK-TG telemetry system sequence detection method. Compared with the 8-waveform XTCOM method, this method can reliably detect under the condition of lower signal-to-noise ratio; compared with the 2048-waveform XTCOM method, the computational complexity of this method is greatly reduced.
本发明的技术方案是:一种低复杂度的Alamouti-SOQPSK-TG遥测系统序列检测方法其特征在于,采用32种XTCOM符号来表示状态转移过程中分支路径对应的波形。The technical solution of the present invention is: a low-complexity Alamouti-SOQPSK-TG telemetry system sequence detection method characterized in that 32 kinds of XTCOM symbols are used to represent the waveform corresponding to the branch path in the state transfer process.
本发明的有益效果是,本发明提供的Alamouti-SOQPSK-TG遥测系统低复杂度序列检测方法:选用32种XTCOM符号来表示每两个码元周期信号可能的波形,这样相比采用8波形XTCOM法采用8种XTCOM符号表示的波形更加准确,检测精度更高;相比2048波形XTCOM法采用2048种XTCOM符号表示波形,本方法具有更低的复杂度。其中采用32种波形表示32种XTCOM符号,特别是通过本发明提出的具体实现方式,很好地实现了低复杂度和高检测精度的完美结合。The beneficial effects of the present invention are that the Alamouti-SOQPSK-TG telemetry system low-complexity sequence detection method provided by the present invention: select 32 kinds of XTCOM symbols to represent the possible waveforms of every two symbol period signals, compared to adopting 8 waveforms XTCOM Compared with the 2048 waveform XTCOM method using 2048 XTCOM symbols to represent waveforms, this method has lower complexity. Among them, 32 kinds of waveforms are used to represent 32 kinds of XTCOM symbols, especially through the specific implementation method proposed by the present invention, the perfect combination of low complexity and high detection accuracy is well realized.
附图说明Description of drawings
图1是Alamouti-SOQPSK-TG遥测系统发送端结构图;Figure 1 is a structural diagram of the sending end of the Alamouti-SOQPSK-TG telemetry system;
图2是Alamouti-SOQPSK-TG遥测系统结收端结构图;Figure 2 is a structural diagram of the receiving end of the Alamouti-SOQPSK-TG telemetry system;
图3是Alamouti码块时的状态转移过程图;Fig. 3 is the state transfer process figure when Alamouti code block;
图4是利用本发明和现有的方法应用在Alamouti-SOQPSK-TG遥测系统进行仿真实验的误码性能图;Fig. 4 is the bit error performance figure that utilizes the present invention and existing method to be applied in Alamouti-SOQPSK-TG telemetry system to carry out emulation experiment;
图5是当时,用XTCOM符号表示第k+1个Alamouti码块对应信号波形的示意图;Figure 5 is when , use the XTCOM symbol to represent the schematic diagram of the signal waveform corresponding to the k+1th Alamouti code block;
图6是当时,用XTCOM符号表示第k+1个Alamouti码块对应信号波形的示意图。Figure 6 is when , the schematic diagram of the signal waveform corresponding to the k+1th Alamouti code block is represented by XTCOM symbols.
具体实施方式Detailed ways
下面结合图3、图4和图5详细说明本发明的实施过程。一种低复杂度的Alamouti-SOQPSK-TG遥测系统序列检测方法。假设基带处理的采样周期为T,每个比特持续时间对接收信号采样N次,s0路和s1路信号的信道响应函数的估计值分别为s0路和s1路信号的时延差估计值与采样周期T的比值为(设s0路信号的时延大于s1路信号时延时,s0路信号的时延小于s1路信号时延时,),可用4N个离散序列r[4Nk],r[4Nk+1],r[4Nk+2],···,r[4Nk+4N-1]表示经过接收端基带处理、参数估计、定时和载波同步后的发送端发送的第k(k=1,2,3…)个Alamouti码块对应的信号。序列检测时,进行如下操作:The implementation process of the present invention will be described in detail below in conjunction with FIG. 3 , FIG. 4 and FIG. 5 . A low-complexity sequence detection method for Alamouti-SOQPSK-TG telemetry systems. Assuming that the sampling period of the baseband processing is T, each bit duration samples the received signal N times, and the estimated values of the channel response functions of the s 0 and s 1 signals are respectively The ratio of the estimated time delay difference between s 0 and s 1 signals to the sampling period T is (Assuming that the time delay of the s 0 -way signal is greater than the time delay of the s 1 -way signal, The time delay of s 0 -way signal is less than the time delay of s 1 -way signal, ), 4N discrete sequences r[4Nk],r[4Nk+1],r[4Nk+2],...,r[4Nk+4N-1] can be used to represent the baseband processing at the receiving end, parameter estimation, timing and A signal corresponding to the kth (k=1, 2, 3...) Alamouti code block sent by the transmitting end after carrier synchronization. During sequence detection, perform the following operations:
第①步:令第1个Alamouti码块对应的所有可能的每一个状态的累积度量M1为0,再令k=1,进入第②步操作。Step ①: Set the cumulative metric M 1 of all possible states corresponding to the first Alamouti code block to be 0, then set k=1, and enter into step ②.
一个Alamouti码块可由4位二进制表示,即一个Alamouti码块共有16种可能的状态。每传输一个Alamouti码块对应一次状态转移。传输第k+1个Alamouti码块时状态转移过程如图3所示,左边的圆圈表示k时刻Alamouti码块(即序列bk,bk+1,bk+2,bk+3对应码块)的所有可能的状态,右边的圆圈表示k+1时刻Alamouti码块(即序列bk+4,bk+5,bk+6,bk+7对应码块)的所有可能的状态,圆圈内的数字表示一种可能的状态(如“0000”对应状态bk=0,bk+1=0,bk+2=0,bk+3=0),线条表示状态转移的分支路径,左边或右边的每个圆圈都与16条线条相连,即左边的每种状态可能沿16条分支路径发生状态转移,右边圆圈内的每种状态都可能由16种状态中的任意一种通过汇入路径得到。An Alamouti code block can be represented by 4-bit binary, that is, an Alamouti code block has 16 possible states in total. Each transmission of an Alamouti code block corresponds to a state transition. The state transition process when the k+1th Alamouti code block is transmitted is shown in Figure 3. The circle on the left represents the Alamouti code block at time k (that is, the corresponding codes of sequences b k , b k+1 , b k+2 , and b k+3 block), and the circle on the right indicates all possible states of the Alamouti code block at time k+1 (ie, the sequence b k+4 , b k+5 , b k+6 , b k+7 corresponds to the code block) , the number in the circle indicates a possible state (for example, "0000" corresponds to the state b k = 0, b k+1 = 0, b k+2 = 0, b k+3 = 0), and the line indicates the state transition Branch path, each circle on the left or right is connected with 16 lines, that is, each state on the left may undergo state transition along 16 branch paths, and each state in the circle on the right may be formed by any of the 16 states One is obtained through the import path.
第②步:计算传输第k+1个Alamouti码块时发生的状态转移对应的每一条分支路径的度量增量,即如图3所示由左边圆圈对应的状态转移到右边圆圈对应的状态时每一条分支路径的度量增量。Step ②: Calculate the metric increment of each branch path corresponding to the state transition that occurs when the k+1th Alamouti code block is transmitted, that is, when the state corresponding to the left circle is transferred to the state corresponding to the right circle as shown in Figure 3 The metric increment for each branch path.
传输第k+1个Alamouti码块时分支路径的度量增量可以分为两个部分Dk+1,0和Dk+1,2。如图3所示,每一条分支路径可以由其首尾两个圆圈内的数字表示,如状态“0000”转移至状态“0000”(即意味着bk=0,bk+1=0,bk+2=0,bk+3=0,bk+4=0,bk+5=0,bk+6=0,bk+7=0)对应的分支路径可以表示为“00000000”。The metric increment of the branch path when transmitting the k+1th Alamouti code block can be divided into two parts D k+1,0 and D k+1,2 . As shown in Figure 3, each branch path can be represented by the numbers in the two circles at the beginning and the end, such as the transition from state "0000" to state "0000" (that is, means b k =0, b k+1 =0, b k+2 =0, b k+3 =0, b k+4 =0, b k+5 =0, b k+6 =0, b k+7 =0) the corresponding branch path can be expressed as "00000000 ".
当时,分支路径“b4kb4k+1b4k+2b4k+3b4k+4b4k+5b4k+6b4k+7”的度量增量Dk+1,0和Dk+1,1的计算方法分别为:when , the metric increments D k + 1,0 and D k + The calculation methods of 1 and 1 are respectively:
当时,分支路径“b4kb4k+1b4k+2b4k+3b4k+4b4k+5b4k+6b4k+7”的度量增量Dk+1,0和Dk+1,1的计算方法分别为:when , the metric increments D k + 1,0 and D k + The calculation methods of 1 and 1 are respectively:
当k=0时,每一条分支路径有b-4=0,b-3=0,b-2=0,b-1=0;当k>0时,对应分支路径“b4kb4k+1b4k+2b4k+3b4k+4b4k+5b4k+6b4k+7”的b4k-4,b4k-3,b4k-2,b4k-1的值可由状态“b4kb4k+1b4k+ 2b4k+3”的幸存路径对应的序列得到,获取幸存路径对应的序列的方法参见第③步。上述涉及类似 ……,等形式的计算项的通用表示为X32(t;c1,···,c5),其计算方法为:When k=0, each branch path has b -4 =0, b -3 =0, b -2 =0, b -1 =0; when k>0, the corresponding branch path "b 4k b 4k+ 1 b 4k+2 b 4k+3 b 4k+4 b 4k+5 b 4k+6 b 4k+7 "The value of b 4k-4 , b 4k-3 , b 4k-2 , b 4k-1 can be determined by the state The sequence corresponding to the survival path of "b 4k b 4k+1 b 4k+ 2 b 4k+3 " is obtained. For the method of obtaining the sequence corresponding to the survival path, refer to step ③. The above involves something like The general expression of calculation items in the form of ..., etc. is X 32 (t; c 1 ,···,c 5 ), and its calculation method is:
公式中的t表示前式中的mT、等,公式中的c1,···,c5代替前式中涉及的不同b4k,b4k+1,b4k+2,b4k+3,b4k+4,b4k+5,b4k+6,b4k+7;再将公式一等号右边的各项用通用表示式X(t;d1,d2,···,d11)表示,其计算方法为:t in the formula represents mT in the previous formula, etc., c 1 ,...,c 5 in the formula replace the different b 4k , b 4k+1 , b 4k+2 , b 4k+3 , b 4k+4 , b 4k+5 , b 4k+6 , b 4k+7 ; then the items on the right side of the first equal sign in the formula are represented by the general expression X(t; d 1 ,d 2 ,···,d 11 ), and the calculation method is:
X(t;d1,d2,···,d11)X(t; d 1 ,d 2 ,···,d 11 )
=cos(φ(t;d1,d2,···,d11))+jsin(φ(t;d1,d2,···,d11))=cos(φ(t; d 1 ,d 2 ,···,d 11 ))+jsin(φ(t;d 1 ,d 2 ,···,d 11 ))
其中q(t)为SOQPSK-TG的相位脉冲函数,q(t-iTb)表示q(t)在时域上延迟iTb,Tb为1比特持续时间,θ(0,1)=π,θ(1,0)=0, Where q(t) is the phase pulse function of SOQPSK-TG, q(t-iT b ) means that q(t) delays iT b in the time domain, and T b is the duration of 1 bit, θ(0,1)=π, θ(1,0)=0,
第③步:计算第k+1个Alamouti码块对应的各状态的汇入路径的累积度量SMk+1,选取各状态幸存路径并存储,更新各个状态的累积度量Mk+1;如果第k+1个Alamouti码块是最后一个Alamouti码块,则进行第④步操作。否则令k=k+1,进行第②步操作。Step ③: Calculate the cumulative metric SM k+1 of the import path corresponding to the k+1th Alamouti code block, select and store the surviving paths of each state, and update the cumulative metric M k+1 of each state; if the th If k+1 Alamouti code blocks are the last Alamouti code blocks, then step ④ is performed. Otherwise, set k=k+1, and proceed to step ②.
其中,汇入路径的累积度量SMk+1计算方法为:Among them, the calculation method of the cumulative metric SM k+1 of the import path is:
SMk+1=Mk+Dk+1,0+Dk+1,1 SM k+1 =M k +D k+1,0 +D k+1,1
其中,Mk表示该条汇入路径左边圆圈对应的状态的累积度量,Dk+1,0和Dk+1,0表示该条汇入路径对应的度量增量。每个状态的16条汇入路径的累积度量计算完成之后,挑出累积度量最小的一条汇入路径作为该状态的幸存路径,幸存路径对应序列和与该条路径相连的左边圆圈中的数字对应。将幸存路径的累积度量作为该状态的累积度量Mk+1。Among them, M k represents the cumulative metric of the state corresponding to the circle on the left of the incoming path, and D k+1,0 and D k+1,0 represent the metric increments corresponding to the incoming path. After the calculation of the cumulative metrics of the 16 incoming paths in each state is completed, pick the incoming path with the smallest cumulative metrics as the surviving path of the state, and the corresponding sequence of the surviving path corresponds to the number in the circle on the left connected to the path . The cumulative metric of the surviving path is taken as the cumulative metric M k+1 of the state.
第④步:根据Viterbi算法,检测出发送序列。Step ④: According to the Viterbi algorithm, detect the sending sequence.
挑选出最后一个Alamouti码块所有状态的幸存路径之后,挑出累积度量最大的状态,找出这个状态对应的幸存路径作为最终的幸存路径,把这条幸存路径经过的状态对应的比特序列作为发送序列的估计值。After selecting the surviving paths of all states of the last Alamouti code block, select the state with the largest cumulative metric, find out the surviving path corresponding to this state as the final surviving path, and send the bit sequence corresponding to the state passed by this surviving path as The estimated value of the sequence.
利用本发明和现有的方法对Alamouti-SOQPSK-TG遥测系统进行仿真实验,实验的误码性能如图6所示,图中虚线表示现有的8波形XTCOM法的误码性能,实线表示本发明的误码性能,横坐标表示Eb/N0(每比特信号能量与噪声功率谱密度的比值),纵坐标表示误码率,带圆圈虚线表示为0时8波形XTCOM法的误码性能,带三角虚线表示表示为-5时8波形XTCOM法的误码性能,带圆圈实线表示为0时32波形XTCOM法的误码性能,带三角实线表示为-5时32波形XTCOM法的误码性能。实验参数为:每个码元的采样点数为N=16,信道响应的相位差θ=0.1π,两路信号的时延差与采样周期的比值分别为0和-5,两根发射天线的功率相等。从图中可以看出:Utilize the present invention and existing method to carry out emulation experiment to Alamouti-SOQPSK-TG telemetering system, the bit error performance of experiment is as shown in Figure 6, and dotted line represents the bit error performance of existing 8 waveform XTCOM method in the figure, and solid line represents Bit error performance of the present invention, the abscissa represents E b /N 0 (the ratio of signal energy per bit to the noise power spectral density), and the ordinate represents the bit error rate, and the dotted line with a circle represents Bit error performance of XTCOM method with 8 waveforms at 0:00, indicated by a dotted triangle line The bit error performance of the 8-waveform XTCOM method when -5 is represented by the solid line with circles The bit error performance of the XTCOM method with 0:32 waveform, indicated by the solid triangle line The bit error performance of the XTCOM method with 32 waveforms at -5. The experimental parameters are: the number of sampling points for each symbol is N=16, the phase difference θ=0.1π of the channel response, the ratio of the time delay difference of the two signals to the sampling period 0 and -5 respectively, the power of the two transmitting antennas is equal. It can be seen from the figure:
①当误码率为10-5,为0时,本发明所示的32波形XTCOM法相比8波形XTCOM法可节省Eb/N0约1.2dB;当误码率为10-5,为-5时,本发明所示的32波形XTCOM法相比8波形XTCOM法可节省Eb/N0约1.4dB。说明本方法相比现有方法能够在更低的信噪比条件下完成检测。① When the bit error rate is 10 -5 , When it is 0, the 32-waveform XTCOM method shown in the present invention can save about 1.2dB of E b /N 0 compared with the 8-waveform XTCOM method; when the bit error rate is 10 -5 , When it is -5, the 32-waveform XTCOM method shown in the present invention can save about 1.4dB of E b /N 0 compared with the 8-waveform XTCOM method. It shows that this method can complete the detection under the condition of lower signal-to-noise ratio than the existing method.
②当误码率为10-5,为-5时,使用本发明所需Eb/N0仅比为0时多0.3dB。说明两路信号存在时延差对本方法检测性能影响不大。② When the bit error rate is 10 -5 , When it is -5, the E b /N 0 required by the present invention is only 0.3dB more than 0. It shows that the time delay difference between the two signals has little effect on the detection performance of this method.
图5和图6说明了如何用32种XTCOM符号表示本地信号的基本原理。图5对应的情况,图6对应的情况。Figures 5 and 6 illustrate the basics of how to represent local signals with 32 XTCOM symbols. Figure 5 corresponds to case, Figure 6 corresponds to Case.
如图5,第k+1个Alamouti码块s0路对应的bit序列为根据文献2所示的方法,传输bit序列用两个XTCOM符号来表示,第一个XTCOM符号对应b4k+4,b4k+5,第二个XTCOM符号对应文献2中只是给出第一个XTCOM符号或第二个XTCOM符号的波形最少用3个bit表示、最多用11个bit表示的可能,3个bit表示对应8种XTCOM符号,11个bit对应2048种XTCOM符号,但是因为文献2对应的场景为单天线,只有一路信号,并未给出对两路信号如何表示波形的任何启示。根据发明人的认真探索和研究,本发明提出的用32种XTCOM符号表示每两个码元周期信号可能的波形对应关系,即用5个bit表示对应的32种XTCOM符号。首先,选择5个bit,而不选择其他数字,是因为通过研究发现:偶数个bit无法完成信号的有效表示,其次选用5bit可以达到复杂度和精确度的有效折中。在采用5bit的情况下,如何进行波形的有效表达,则采用本发明前面所述的方法,下面再重点论述一下:As shown in Figure 5, the bit sequence corresponding to the k+1th Alamouti code block s 0 is According to the method shown in Document 2, the bit sequence is transmitted Represented by two XTCOM symbols, the first XTCOM symbol corresponds to b 4k+4 , b 4k+5 , and the second XTCOM symbol corresponds to Document 2 only gives the possibility of representing the waveform of the first XTCOM symbol or the second XTCOM symbol with at least 3 bits and a maximum of 11 bits. 3 bits represent 8 kinds of XTCOM symbols, and 11 bits correspond to 2048 An XTCOM symbol, but because the scene corresponding to Document 2 is a single antenna with only one signal, it does not give any enlightenment on how to represent the waveform of the two signals. According to the inventor's earnest exploration and research, the present invention proposes to use 32 kinds of XTCOM symbols to represent the possible waveform correspondence of every two symbol period signals, that is, to use 5 bits to represent the corresponding 32 kinds of XTCOM symbols. First of all, 5 bits are chosen instead of other numbers because it is found through research that an even number of bits cannot complete the effective representation of the signal, and secondly, choosing 5 bits can achieve an effective compromise between complexity and accuracy. Under the situation of adopting 5bit, how to carry out the effective expression of waveform, then adopt the method described above of the present invention, discuss again emphatically below:
第k+1个Alamouti码块s0路对应的bit序列为传输bit序列用两个XTCOM符号来表示,第一个XTCOM符号对应b4k+4,b4k+5,第二个XTCOM符号对应第一个XTCOM符号的波形可以由前面的bit序列来确定,第二个XTCOM符号的波形可以由前面的bit序列来确定,两个XTCOM符号的表达式均可用前述的公式一X32(t;c1,···,c5)表示。如图5所示,由于s0路信号与s1信号存在时延,在s0路信号的每个XTCOM符号占用的时间内对应s1路信号的两个XTCOM符号;在s0路信号的第k+1个Alamouti码块占用的时间内对应s1路信号的三个XTCOM符号。因此,如图5所示,s1路信号的第一个XTCOM符号可以由bit序列来确定,s1路信号的第二个XTCOM符号可以由bit序列来确定,s1路信号的第三个XTCOM符号可以由bit序列b4k+2,b4k+3,b4k,b4k+1,b4k+6来确定。因此每个XTCOM符号对应25种波形。当时,同理,如图6所示。The bit sequence corresponding to the k+1th Alamouti code block s 0 way is transmit bit sequence Represented by two XTCOM symbols, the first XTCOM symbol corresponds to b 4k+4 , b 4k+5 , and the second XTCOM symbol corresponds to The waveform of the first XTCOM symbol can be determined by the previous bit sequence To determine, the waveform of the second XTCOM symbol can be determined by the previous bit sequence To determine, the expressions of the two XTCOM symbols can be expressed by the aforementioned formula one X 32 (t; c 1 ,···,c 5 ). As shown in Figure 5, due to the time delay between the s0 signal and the s1 signal, the time occupied by each XTCOM symbol of the s0 signal corresponds to the two XTCOM symbols of the s1 signal; The time occupied by the k+1th Alamouti code block corresponds to three XTCOM symbols of the s1 -channel signal. Therefore, as shown in Figure 5, the first XTCOM symbol of the s 1 -way signal can be represented by the bit sequence To determine, the second XTCOM symbol of the s 1 -way signal can be determined by the bit sequence To determine, the third XTCOM symbol of the s 1 channel signal can be determined by the bit sequence b 4k+2 , b 4k+3 , b 4k , b 4k+1 , b 4k+6 . Therefore, each XTCOM symbol corresponds to 25 kinds of waveforms. when , similarly, as shown in Figure 6.
参考文献1:Rice M,Nelson T,Palmer J,et al.Space-Time Coding forAeronautical Telemetry:Part II—Decoder and System Performance[J].IEEETransactions on Aerospace&Electronic Systems,2017,53(4):1732-1754.参考文献2:REDUCED COMPLEXITY TRELLIS DETECTION OF SOQPSK-TG.International TelemeteringConference Proceedings.Reference 1: Rice M, Nelson T, Palmer J, et al. Space-Time Coding for Aeronautical Telemetry: Part II—Decoder and System Performance [J]. IEEE Transactions on Aerospace & Electronic Systems, 2017, 53(4): 1732-1754. Reference 2: REDUCED COMPLEXITY TRELLIS DETECTION OF SOQPSK-TG. International Telemetering Conference Proceedings.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201910540015.XA CN110266411A (en) | 2019-06-21 | 2019-06-21 | Low-complexity sequence detection method for dual-antenna telemetry system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201910540015.XA CN110266411A (en) | 2019-06-21 | 2019-06-21 | Low-complexity sequence detection method for dual-antenna telemetry system |
Publications (1)
Publication Number | Publication Date |
---|---|
CN110266411A true CN110266411A (en) | 2019-09-20 |
Family
ID=67920072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201910540015.XA Pending CN110266411A (en) | 2019-06-21 | 2019-06-21 | Low-complexity sequence detection method for dual-antenna telemetry system |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN110266411A (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103200142A (en) * | 2013-03-22 | 2013-07-10 | 西安电子科技大学 | Two-state simplified method of non-recursive shaped offset quadrature phase shift keying (SOQPSK)-TG signal |
CN108881089A (en) * | 2018-07-09 | 2018-11-23 | 西安电子科技大学 | The pilot detection method of SOQPSK modulated signal in telemetry system |
CN108965179A (en) * | 2018-07-09 | 2018-12-07 | 西安电子科技大学 | Enhance two cadence bias estimations of the telemetering comprehensive network system under multipath channel |
CN109088836A (en) * | 2018-07-09 | 2018-12-25 | 西安电子科技大学 | The data block building method of single carrier frequency domain equalization SOQPSK-TG signal |
-
2019
- 2019-06-21 CN CN201910540015.XA patent/CN110266411A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103200142A (en) * | 2013-03-22 | 2013-07-10 | 西安电子科技大学 | Two-state simplified method of non-recursive shaped offset quadrature phase shift keying (SOQPSK)-TG signal |
CN108881089A (en) * | 2018-07-09 | 2018-11-23 | 西安电子科技大学 | The pilot detection method of SOQPSK modulated signal in telemetry system |
CN108965179A (en) * | 2018-07-09 | 2018-12-07 | 西安电子科技大学 | Enhance two cadence bias estimations of the telemetering comprehensive network system under multipath channel |
CN109088836A (en) * | 2018-07-09 | 2018-12-25 | 西安电子科技大学 | The data block building method of single carrier frequency domain equalization SOQPSK-TG signal |
Non-Patent Citations (3)
Title |
---|
ERIK PERRINS 等: "Reduced-Complexity Approach to Iterative Detection of Coded SOQPSK", 《IEEE TRANSACTIONS ON COMMUNICATIONS》 * |
MICHAEL RICE 等: "Space-Time Coding for Aeronautical Telemetry: Part II—Decoder and System Performance", 《IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS(VOLUME:53,ISSUE:4,AUG.2017)》 * |
李泰立 等: ""基于XTCQM的Alamouti-SOQPSK-TG遥测系统的高性能检测"", 《遥测遥控》 * |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4584943B2 (en) | Method and apparatus for data transmission using multiple transmit antennas | |
US5862156A (en) | Adaptive sequence estimation for digital cellular radio channels | |
CN105814855B (en) | Precoding in a superNyquist transmission system | |
US5862192A (en) | Methods and apparatus for equalization and decoding of digital communications channels using antenna diversity | |
Blum | Some analytical tools for the design of space-time convolutional codes | |
TWI431988B (en) | Receivers and symbol decoders thereof | |
CN110365365A (en) | A Multi-ary Differential Chaos Keying Method Based on Chaos Shaping Filter | |
WO2018068540A1 (en) | Overlapped multiplexing-based modulation and demodulation method and device | |
CN103338175B (en) | A kind of incoherent CPM signal demodulating apparatus and demodulation method | |
CN115643140B (en) | Multistage cyclic shift index differential chaos shift keying system and method | |
CN115314163B (en) | Underwater Acoustic Communication System Based on Monte Carlo Polar Code Decoding Cascade Iteration | |
CN108833321B (en) | Code Block Synchronization Method of Coded CPM Signal Based on Differential Phase Waveform Matching | |
CN109818894B (en) | GMSK signal detection method and detection device under multipath channel | |
CN103200142A (en) | Two-state simplified method of non-recursive shaped offset quadrature phase shift keying (SOQPSK)-TG signal | |
CN103986677B (en) | Keying modulation method based on transmit diversity | |
CN110266411A (en) | Low-complexity sequence detection method for dual-antenna telemetry system | |
WO2018068541A1 (en) | Overlapped multiplexing-based decoding method and device, and modulation and demodulation method and system | |
CN106341199B (en) | A kind of signal-to-noise ratio based on Manchester code determines method | |
Blackmon et al. | Iterative equalization, decoding, and soft diversity combining for underwater acoustic channels | |
CN104104418A (en) | High transmission rate and bandwidth utilization rate of MIMO Multi-h CPM wireless communication method | |
CN106230490A (en) | A kind of phase place in order rotates Precoding Design method | |
CN105162737A (en) | Low-complexity self-adapting single carrier frequency domain equalization method and device for software radio system | |
CN103346860A (en) | Decoding unit of wireless transmission system and decoding method thereof | |
USH2152H1 (en) | Telemetry system having amplitude modulation of Walsh functions | |
Chandran et al. | Decision-directed symbol timing recovery for SOQPSK |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190920 |
|
WD01 | Invention patent application deemed withdrawn after publication |